| http://www.w3.org/ns/prov#value | - e end, said recess including at least one interlocking member, the ring member having a centering collar having at least one interlocking member complementary to the interlocking member in said recess, said ring member having an inner bore with a counterbore to produce an inner stop shoulder, said base element, at one end, being provided with a head to form an external stop shoulder to engage the
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